load devfile schema for validation by it's apiVersion

[sparkoo]

What does this PR do?

Make it possible to have multiple devfile schemas for validation. The schema is now placed in directory named by version and supported versions are listed in .devfile.Constants#SUPPORTED_VERSIONS

What issues does this PR fix or reference?

#14824

[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has been successful:

• build details
• logs and configs
• "che-server" docker image: maxura/che-server:14834

[che-bot]

E2E tests of Eclipse Che Multiuser on OCP has failed:

• Build details
• Test report
• docker image: eclipseche/che-server:14834
  https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "ci-test" to rerun the test.

[che-bot]

E2E tests of Eclipse Che Multiuser on OCP has failed:

• Build details
• Test report
• docker image: eclipseche/che-server:14834
  https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "ci-test" to rerun the test.

[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has failed:

• build details
• test report
• logs and configs
• "che-server" docker image: maxura/che-server:14834
• https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "crw-ci-test" to rerun the test.

[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has been successful:

• build details
• logs and configs
• "che-server" docker image: maxura/che-server:14834

[che-bot]

E2E tests of Eclipse Che Multiuser on OCP has failed:

• Build details
• Test report
• docker image: eclipseche/che-server:14834
  https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "ci-test" to rerun the test.

[mshaposhnik]

In general OK for me (with some minor comments).

[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has failed:

• build details
• test report
• logs and configs
• "che-server" docker image: maxura/che-server:14834
• https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "crw-ci-test" to rerun the test.

[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has failed:

• build details
• test report
• logs and configs
• "che-server" docker image: maxura/che-server:14834
• https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "crw-ci-test" to rerun the test.

[sleshchenko]

👍

[che-bot]

E2E tests of Eclipse Che Multiuser on OCP has been successful:

• Build details
• Test report
• docker image: eclipseche/che-server:14834

[dmytro-ndp]

@sparkoo: there is known regression in Happy path tests result: #14862.

[metlos]

LGTM apart from the trivial error message formatting nitpicks. Feel free to ignore them if you don't agree. I like the simplicity of the solution. At the same time we can build on this in the future. Good job!